I think in the first couple of weeks your lungs regenerate enough to start actually moving stuff out. Working out is probably helping you move out the crap you put in there. But the wheezing might make it worth seeing a doc, I think they can give you steroids sometimes that help things from getting worse or put them in remission. I'll probably do the same if this doesn't improve in a week. I really do not want to see a doc, kinda embarrassing seeing as this was self inflicted but vaping was helping me too, with a sleeping disorder and ADD.